Chapter 23: Our Environment: Energy Flow in the Ecosystem – Important MCQs
- Which of the following is a biotic component of the ecosystem?
A. Air
B. Soil
C. Plants
D. Water
✔️ Answer: C. Plants - Which of the following organisms is a producer?
A. Grass
B. Deer
C. Lion
D. Vulture
✔️ Answer: A. Grass - In a food chain, energy flow is:
A. Bidirectional
B. Unidirectional
C. Circular
D. Multidirectional
✔️ Answer: B. Unidirectional - What percentage of energy is transferred from one trophic level to the next?
A. 90%
B. 50%
C. 10%
D. 100%
✔️ Answer: C. 10% - Which of the following is a decomposer?
A. Bacteria
B. Lion
C. Deer
D. Tiger
✔️ Answer: A. Bacteria - The correct sequence of the food chain is:
A. Producer → Decomposer → Consumer
B. Producer → Consumer → Decomposer
C. Consumer → Producer → Decomposer
D. Decomposer → Producer → Consumer
✔️ Answer: B. Producer → Consumer → Decomposer - Which gas is mainly responsible for the greenhouse effect?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen
✔️ Answer: B. Carbon dioxide - Which of the following is an abiotic component of the ecosystem?
A. Plants
B. Animals
C. Soil
D. Fungi
✔️ Answer: C. Soil - Which of the following is a primary consumer?
A. Grass
B. Rabbit
C. Tiger
D. Fungus
✔️ Answer: B. Rabbit - An example of a food web is:
A. Linear chain of organisms
B. Simple feeding pathway
C. Interconnected food chains
D. None of these
✔️ Answer: C. Interconnected food chains